R语言查找两个日期之间的月数

在这篇文章中，我们将讨论如何用R编程语言查找两个日期之间的月数。

例子

输入： Date_1 = 2020/02/21

Date_2 = 2020/03/21

输出： 1

解释： 在Date_1和Date_2中，只有一个月的差别。

这里我们将使用 seq() 函数来得到结果。这个函数是用来创建一个向量中的元素序列。它需要长度和值之间的差异作为可选的参数。

语法: length(seq(from=date_1, to=date_2, by=’month’)-1

其中：seq是生成数字序列的函数，from是起始日期，to是结束日期。

例1： 在下面的例子中，我们在两个不同的变量中存储了两个日期，通过使用length(seq(from=date_1, to=date_2, by=’month’))我们可以找到这两个日期之间的月数。

# creating date_1 variable and storing date in it.
date_1<-as.Date("2020-08-10")
 
# creating date_2 variable and storing date in it.
date_2<-as.Date("2020-10-10")
 
# Here first date will  start from 2020-08-10 and
# end by 2020-10-10.Here increment is done by month.
# This three dates  will be generated as we used
# seq and this dates will be stored in a. 
a = seq(from = date_1, to = date_2, by = 'month'))
 
# Here we are finding length of a and we are subtracting
# 1 because we dont need to include current month.
length(a)-1

输出

例2： 用不同的日期进行检查。

# creating date_1 variable and storing date in it.
date_1<-as.Date("2020-01-23")
 
# creating date_2 variable and storing date in it.
date_2<-as.Date("2020-9-25")
 
# Here first date will  start from 2020-01-23
# and end by 2020-9-25.Here increment is done
# by month.This three dates  will be generated
# as we used seq and this dates will be stored in a. 
a=seq(from = date_1, to = date_2, by = 'month'))
 
# Here we are finding length of a and we are
# subtracting 1 because we dont need to include
# current month.
length(a)-1

输出